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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018c2e8350692fae1c4224b5c5d3d21d57fed4121307531ade9618fc2d9c2edd' 
  AND token = '/6dDDWnEqAe1I7f4w65ma+6Dic9kI18wR7AYgynlsvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}